Police in Prince George are asking businesses to be vigilant after a "dramatic rise" in counterfeit bills in the city last month.
Mounties say they received 17 reports of fake bills in December, far more than the typical one or two cases in an average month.
Police say some of the bills appear to be photocopies of legitimate bills printed on paper, which may be the latest trend in fraudulent currency attempts.
Businesses are asked to politely refuse bills that are suspected to be fake and to contact police.